Thermal printer and drive system for controlling print ribbon ve

Details Thermal printer and drive system for controlling print ribbon ve Thermal printer and drive system for controlling print ribbon ve

1999-05-27

2000-07-04

Hilten, John S.

Typewriting machines

Including interposed inking device for record-medium

Ribbon-feeding mechanism

400223, 400225, 400232, B41J 3322, B41J 3336

Patent

active

060829141

ABSTRACT:
A thermal printer having a supply of media with a rotatable platen on which the media is moved for printing by a thermal printing head. A supply spindle supplies print ribbon from a supply spool mounted thereon, and a take-up spindle takes up the used print ribbon on a take-up spool. The spindles are each driven by a motor and controlled by a controller which detects the Back EMF (BEMF) of the motors, and calculates the velocity of the spindles, spool, and print ribbon to control each motor based on the BEMF. The status of the print ribbon as to low condition, breaks, ribbon full and other monitoring functions can be provided to a remote host computer or other monitoring station.

REFERENCES:
patent: 5366303 (1994-11-01), Barrus et al.
patent: 5490638 (1996-02-01), Driftmyer et al.
patent: 5634731 (1997-06-01), Kita et al.
patent: 5820277 (1998-10-01), Schulte

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